Want to know how much boost is the WR capable of,and a what point does it over speed?
Sep 15, 2005, 12:27 PM
#1
Want to know how much boost is the WR capable of,and a what point does it over speed?
I first made this post https://www.evolutionm.net/forums/sh...d.php?t=155164 prior to speaking to FP about what in house testing showed the WR could hold... boost wise. I recently contacted FP as to the question of at what point the turbo would be over sped, and at what point the turbo's pressure differential would be slipping into the "red zone" causing too much back pressure. Here is the short answer as received:
Zeusmotorworks: At what point would you consider the turbo being "over spun" based on boost pressure... and at what boost pressure does the pressure differential start backing it up?
FP: Under intended operating conditions, boost under 30psi, the turbo doesn't overspeed.
FP: There is a decreasing boost pressure that you want to stay under dependent on RPM.
FP: at 5k 35psi is fine, BP ok
FP: at 6k 28psi Ok
FP: at 7k 26psi ok
FP: at 8k not much point running higher than 25psi.
Zeusmotorworks: That's what I was looking for... thanks!
FP: we actually welded some slugs into the WG holes of a TH and drilled then out so the WG holes were .250"
FP: we could run more than 30psi to 8500
FP: but you get lots of BP and no more power
Cuss and discuss away... I believe as stated in the thread link above, that the perceived problems with the WR not delivering have nothing to do with the turbo it self not being able to deliver what was first claimed.
Short of the "big manufacturers" who have a horde of engineers at their disposal, I don't know of anyone who designs turbo products from the ground up other than Robert at Forced Performance. Yes the WR just happened to be a retro fit as a first step, but if you look at the line FP offers, there is a lot more going on there than people take into consideration. I'd expect to see much more in the future for the Evo community.
Zeusmotorworks: At what point would you consider the turbo being "over spun" based on boost pressure... and at what boost pressure does the pressure differential start backing it up?
FP: Under intended operating conditions, boost under 30psi, the turbo doesn't overspeed.
FP: There is a decreasing boost pressure that you want to stay under dependent on RPM.
FP: at 5k 35psi is fine, BP ok
FP: at 6k 28psi Ok
FP: at 7k 26psi ok
FP: at 8k not much point running higher than 25psi.
Zeusmotorworks: That's what I was looking for... thanks!
FP: we actually welded some slugs into the WG holes of a TH and drilled then out so the WG holes were .250"
FP: we could run more than 30psi to 8500
FP: but you get lots of BP and no more power
Cuss and discuss away... I believe as stated in the thread link above, that the perceived problems with the WR not delivering have nothing to do with the turbo it self not being able to deliver what was first claimed.
Short of the "big manufacturers" who have a horde of engineers at their disposal, I don't know of anyone who designs turbo products from the ground up other than Robert at Forced Performance. Yes the WR just happened to be a retro fit as a first step, but if you look at the line FP offers, there is a lot more going on there than people take into consideration. I'd expect to see much more in the future for the Evo community.
Last edited by Zeus; Sep 15, 2005 at 12:39 PM.
Sep 16, 2005, 05:35 AM
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Yeah, since I got the hp actuator on the turbo last night I can hold more pressure. If he says 26psi @ 7k is the "limit" then I'll shoot for that.
Thanks for the info Zeus.
Man I need to get back on a dyno.
Thanks for the info Zeus.
Man I need to get back on a dyno.
Sep 27, 2005, 06:52 AM
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Little update Zeus, it makes some serious pressure with the new actuator. Too much actually, I cracked #4 piston. I'm in to process of fixing it, but I'm stroking the motor. So we'll see how it breaths on a 2.3. I'm hoping to see near 500whp(dynojet). I'm guessing I was somewhere between 430-440(dynojet) with the hp actuator on 28->24psi.
BTW, I crack the piston on around 31-33psi(guessing).
Ivan
BTW, I crack the piston on around 31-33psi(guessing).
Ivan
Sep 27, 2005, 07:20 AM
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Originally Posted by Ivan_C
Little update Zeus, it makes some serious pressure with the new actuator. Too much actually, I cracked #4 piston. I'm in to process of fixing it, but I'm stroking the motor. So we'll see how it breaths on a 2.3. I'm hoping to see near 500whp(dynojet). I'm guessing I was somewhere between 430-440(dynojet) with the hp actuator on 28->24psi.
BTW, I crack the piston on around 31-33psi(guessing).
Ivan
BTW, I crack the piston on around 31-33psi(guessing).
Ivan
Steve (the guy with the BBY Evo at Summit Point)
Sep 27, 2005, 08:03 AM
#6
Originally Posted by Ivan_C
Little update Zeus, it makes some serious pressure with the new actuator. Too much actually, I cracked #4 piston. I'm in to process of fixing it, but I'm stroking the motor. So we'll see how it breaths on a 2.3. I'm hoping to see near 500whp(dynojet). I'm guessing I was somewhere between 430-440(dynojet) with the hp actuator on 28->24psi.
BTW, I crack the piston on around 31-33psi(guessing).
Ivan
BTW, I crack the piston on around 31-33psi(guessing).
Ivan
Yes, it makes a lot more boost than people thought. It was a week actuator all along. If you get boost creep issues, remember to loosen the actuator tension one half turn until it stops. I wish there were finer threads on the actuator to give greater resolution. I've found with my setup, I can live with creep, or a little taper... I chose the latter.
I believe it is RoundPro who has been running the WR on a 2.3 for a while now. He's been cleaning up at his local road course. Not to mention the RRE crew has been kicking the s h i t out of the competition with their stroker fed by the bunny.
Last edited by Zeus; Sep 27, 2005 at 08:13 AM.
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Sep 27, 2005, 09:03 AM
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Originally Posted by propellerhead
Heh heh, so you're going to a stroker afterall? I'm very, very interested to see how the WR runs on a 2.3.
Steve (the guy with the BBY Evo at Summit Point)
Steve (the guy with the BBY Evo at Summit Point)
Originally Posted by Zeus
Sorry to hear about the piston
Yes, it makes a lot more boost than people thought. It was a week actuator all along. If you get boost creep issues, remember to loosen the actuator tension one half turn until it stops. I wish there were finer threads on the actuator to give greater resolution. I've found with my setup, I can live with creep, or a little taper... I chose the latter.
I believe it is RoundPro who has been running the WR on a 2.3 for a while now. He's been cleaning up at his local road course. Not to mention the RRE crew has been kicking the s h i t out of the competition with their stroker fed by the bunny.
Yes, it makes a lot more boost than people thought. It was a week actuator all along. If you get boost creep issues, remember to loosen the actuator tension one half turn until it stops. I wish there were finer threads on the actuator to give greater resolution. I've found with my setup, I can live with creep, or a little taper... I chose the latter.
I believe it is RoundPro who has been running the WR on a 2.3 for a while now. He's been cleaning up at his local road course. Not to mention the RRE crew has been kicking the s h i t out of the competition with their stroker fed by the bunny.
Originally Posted by gsujeff55
what actuator you running to get that much boost out of it?
Sep 27, 2005, 09:10 AM
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Originally Posted by Ivan_C
Yeah figure while I'm in there changing rods and pistons, I'll change the crank and do a little bit of clearancing. I didn't put the screen name together with the person/car until this morning.
It should be fun to see what kind of times you can pull with the new setup.
Sep 27, 2005, 09:24 AM
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Originally Posted by Mikey52
Sneaky bastard. Here you were telling us you were going to keep the stock displacement. It should be fun to see what kind of times you can pull with the new setup.
It should be fun to see what kind of times you can pull with the new setup.
Last minute decision yesterday, after a good bit of research on Sunday and Monday. Yeah, not sure if I'll get to test it this race year, not sure how long it's going to take me to break it in and get it retuned. Maybe one of the later Oct early Nov races.
Last edited by Ivan_C; Sep 28, 2005 at 05:05 AM.
Sep 27, 2005, 09:51 AM
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Originally Posted by Zeus
I believe it is RoundPro who has been running the WR on a 2.3 for a while now. He's been cleaning up at his local road course. Not to mention the RRE crew has been kicking the s h i t out of the competition with their stroker fed by the bunny.
I've got a GT35R with a .63 A/R hotside that surges like an SOB at part throttle on my stroker. Works great at WOT and pulls like a beast when the tune is correct. Rather than screw around with trying to find the right hotside combination I am seriously considering "downgrading" to a 20g or WR.
Sep 27, 2005, 10:43 AM
#14
Originally Posted by propellerhead
Do you know if they are having ANY issues with part throttle compressor surge with the bunny? I'll have to write RRE and see if they have advice.
I've got a GT35R with a .63 A/R hotside that surges like an SOB at part throttle on my stroker. Works great at WOT and pulls like a beast when the tune is correct. Rather than screw around with trying to find the right hotside combination I am seriously considering "downgrading" to a 20g or WR.
I've got a GT35R with a .63 A/R hotside that surges like an SOB at part throttle on my stroker. Works great at WOT and pulls like a beast when the tune is correct. Rather than screw around with trying to find the right hotside combination I am seriously considering "downgrading" to a 20g or WR.
I'm not sure what Kent is driving now... My last understanding was he was sporting the WR (I've not spoken to FP in a while)... with a FP beast waiting in the winds
Sep 27, 2005, 10:59 AM
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Originally Posted by Ivan_C
Little update Zeus, it makes some serious pressure with the new actuator. Too much actually, I cracked #4 piston. I'm in to process of fixing it, but I'm stroking the motor. So we'll see how it breaths on a 2.3. I'm hoping to see near 500whp(dynojet). I'm guessing I was somewhere between 430-440(dynojet) with the hp actuator on 28->24psi.
BTW, I crack the piston on around 31-33psi(guessing).
Ivan
BTW, I crack the piston on around 31-33psi(guessing).
Ivan